Healthcare Insights
Largest obstetrics/gynecology physician group practices
If you’re selling in the obstetrics or gynecology space, physician groups can be appealing targets for your marketing efforts because they tend to centralize their purchasing decisions, allowing you to profit from bulk sales and long-term partnerships through a single marketing connection.
Physician group size and specialty are two useful metrics for prioritizing physician group practices. By focusing on the largest physician groups within your target specialty, you can gain access to bigger sales opportunities and more relevant contacts.
How many obstetrics/gynecology physician group practices are there in the U.S.?
Our database shows that there are more than 6,000 obstetrics/gynecology physician group practices in the U.S., ranging from a single practitioner to more than 800 physicians. Because physician groups usually operate multiple locations, the number of physician group practices does not reflect the number of obstetrics/gynecology practices in the United States.
Why target obstetrics/gynecology physician groups?
Targeting a private practice doctor rather than a hospital or health system can offer easier access to key executives and decision-makers. Doctors working in large physician groups within your target specialty can be ideal points of contact for your marketing efforts.
Large obstetrics/gynecology physician groups require specialized technology, equipment, and training, and can present significant opportunities for sales and other valuable connections.
Largest obstetrics/gynecology physician group practices by number of physicians
| Rank | Obstetrics/gynecology physician group | State | Definitive ID | # of OB/GYN physicians | Explore dataset |
|---|---|---|---|---|---|
| 1 | Southern California Permanente Medical Group | CA | 550748 | 879 | Explore |
| 2 | The Permanente Medical Group | CA | 550751 | 848 | Explore |
| 3 | NYU Langone Health Physicians (FKA NYC University Physicians Network) | NY | 577713 | 582 | Explore |
| 4 | Hackensack Meridian Health Physicians (FKA Hackensack Meridian Health Medical Group) | NJ | 703832 | 518 | Explore |
| 5 | Pediatrix Medical Group | FL | 975490 | 509 | Explore |
| 6 | HCA Florida Healthcare Physicians | FL | 1047395 | 479 | Explore |
| 7 | CHRISTUS Health Physicians (FKA CHRISTUS Physician Group) | LA | 746511 | 344 | Explore |
| 8 | RWJBarnabas Health Medical Group (FKA Barnabas Health Medical Group) | NJ | 597090 | 343 | Explore |
| 9 | Axia Womens Health (FKA Regional Womens Health Group) | NJ | 550558 | 329 | Explore |
| 10 | Ob Hospitalist Group (AKA OBHG) | SC | 678171 | 329 | Explore |
| 11 | MEDNAX Pediatric & Congenital Cardiology Associates (AKA Pediatric Cardiology of Austin) | TX | 944291 | 322 | Explore |
| 12 | Advocate Medical Group | IL | 550221 | 315 | Explore |
| 13 | University of Pittsburgh Physicians (AKA UPMC Physicians) | PA | 550835 | 307 | Explore |
| 14 | Northside Hospital Physicians (FKA Northside Network Providers) | GA | 749148 | 301 | Explore |
| 15 | Northwestern Medicine Physicians | IL | 1063946 | 300 | Explore |
| 16 | Corewell Health Physicians (FKA Beaumont Health Physicians) | MI | 752078 | 295 | Explore |
| 17 | Orlando Health Physicians | FL | 1025289 | 289 | Explore |
| 18 | Mercy Clinic Physicians | OK | 719401 | 283 | Explore |
| 19 | UNC Health Caldwell Physicians | NC | 1051313 | 280 | Explore |
| 20 | Piedmont Healthcare Physicians | GA | 1007685 | 280 | Explore |
Fig. 1 Analysis of data from the Definitive Healthcare PhysicianGroupView product. The number of practices represents only those listed as “active” in our database. Data accessed March 2025.
What is the largest obstetrics/gynecology physician group in the U.S.?
Southern California Permanente Medical Group is the largest obstetrics/gynecology physician group, with 879 physicians.
The Permanente Medical Group is the second largest obstetrics/gynecology physician group, with 848 physicians.
The third largest OB/GYN physician group is NYU Langone Health Physicians, with 582 practitioners.
Tips for targeting obstetrics/gynecology physician groups
The challenges and priorities of each obstetrics/gynecology physician group are unique, so your marketing approach for each group should be unique, as well. Intelligence like tech install data, procedure and claims data, and Medicare charges can provide insights into the physician group that will allow you to personalize your outreach for maximum efficiency.
Focus on how your product, technology, or service can improve patient outcomes, enhance diagnostic capabilities, or optimize operations—whichever challenges are most pressing for the physician group. Be sure to include success stories from case studies or clinical trials that are relevant to their needs, too.
Learn more
We create our Healthcare Insights using intelligence from the Definitive Healthcare platform. To explore additional data points and power a more intelligent sales strategy by creating tailored messaging for their decision-makers, start a free trial now and get access to the latest procedure data, Medicare charges, and claims and affiliation insights for physicians, physician groups, and various healthcare facilities.
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